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Cummins 20GSBB-6713A - 20kW Home Standby Generator

Cummins Power Generation Electric Generators and Accessories
Model: 20GSBB-6713A
(Based on expert analysis, manufacturer ratings and customer reviews)
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1 Review
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  • Features
  • Specs
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Run Watts
Rated Watts
120/240 Single-Phase
Powered By A 993cc Air-Cooled V-Twin OHV Engine
Automotive-style lubrication system w/ Spin-on oil filter

Weather Protective Sound Enclosure
Made of thick, 11-gauge powder coated aluminum
All maintenance points are easily accessible w/o tools
Large, low noise, automotive grade corrosion resistant muffler

Cummins Proprietary Control System
Self-diagnostics, gen-set protection and safety features

Internet & E-Mail Capability
Monitor gen status online & can email if service is required

In-Home LCD Display
Easily monitor, run and exercise generator

Easy Installation
Innovative molded polymer base - no need for a concrete pad
Lift-off enclosure for close proximity installs & 12" fuel line

Warm Weather Model - Designed For Use Above 32F

Automatic Transfer Switch - Sold Separately

5 Year or 2000 Hour Limited Warranty
Engine Brand
Cummins Onan
993 CC
Consumer Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
120/240 Single-Phase
60 Hertz
Surge Watts
20000 Watts
Rated Watts
20000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
17280 Watts
LP Power Capacity
19000 Watts
NG Fuel Consumption @ 50% Load
135 (BTU: 135,000 BTU/HR) ft³/hr
NG Fuel Consumption @ 100% Load
240 (BTU: 240,000 BTU/HR) ft³/hr
LP Fuel Consumption @ 50% Load
1.5 (BTU: 136,125 BTU/HR) gallons/hr
LP Fuel Consumption @ 100% Load
3 (BTU: 272,250 BTU/HR) gallons/hr
Rated Amps
83 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
62 dbA
Transfer Switch
Automatic (Not Included)
Not Included (530 CCA)
A/C Ton Rating
Mounting Pad
Composite (Included)
Cooling System
Air Cooled
UL Listed
Grade Type
Made in USA
540 Pounds
Product Style
Standby Generator
Product Length
53 Inches
Product Width
43 Inches
Product Height
34.7 Inches
Consumer Warranty
5 Years
  2 Questions
Q: 1. I have been advised that the Cummins Onan warranty only remains affective if a certified CO technician installs and annually services the unit - And that the service contract (locally $500/yr) is only for routine check and does not cover any actual repair or parts. This is onerous - Is it accurate and standard for the CO brand?
2. Is there a formula or chart where I can plug in #s to calculate how long a certain # of KW will run per gallon of propane? (ie, How long would a 20,000 KW unit run at full capacity on 300 gal of LP?)

by Anna Kerr from Virginia on October 21, 2013

A: We have confirmed with Cummins Onan....

"The Cummins Onan warranty covers the product for quality & workmanship. These products can be installed by a qualified contractor and the warranty stays with the product. They can also be maintained by whomever the owner is comfortable with."

The fuel consumption information is available on the manufacturers specification sheet and the 20kW model uses the following....

25% - 1.0 Gal/Hr.
50% - 1.5 Gal/Hr.
75% - 2.1 Gal/Hr.
100% - 3.0 Gal/Hr.

You can calculate the full load (100%) based on a 24 hour time period.

3.0 x 24 = 72 Gal Per Day

This should help you determine the tank size for maximum usage. Please keep in mind that fuel consumption is based on the load put on the generator. So, if you are conscious of what you are running in the home and keep the loads low you will use lower amounts of fuel.

RS20 Specification Sheet

by Mike, Product Expert

Q: What transfer switch would go with the RS20A oNAN GENERATOR . Does Onan have a transfer switch like Generac 16 circuit ?
by Pete from Maryland on June 09, 2012

A: Cummins Onan does not have a 16ckt switch available. They only offer either whole house switches with service entrance disconnects or switches that would power sub-panels. You could install a small sub-panel and put your emergency circuits in it and have the generator power that panel only.

Here is a link to the switches they offer:

Cummins Onan Transfer Switches

by Mike, Product Expert

Cummins Power Generation 20GSBB-6713A Reviews & Ratings
Overall Rating
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
Alway Order This Unit Fo... (1)
Reliable (1)
Quiet (1)
Durable (1)
None to display.
1 Review  Sort by 
Anthony R.
Fairfield, NC
Total Reviews
2 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Cummins 20gsbb - 6713a Home Standby Generator
I have installed lots of these generator they are perfect for a small house with one large a/c or two small a/c units. They have good power and will operator your lights and heat if needed. When installed by a certified Cummins Onan dealer and properly maintained they will last for years. I have installed Generac and Cummins unit and the Cummins is by far a better generator. I would recommend the Cummins Onan to anyone interested in purchasing a small standby generator.
Pros: Durable, Quiet, Reliable, Alway Order This Unit For Cold Weather Start Features
Anthony Recommends This Cummins Power Generation Product
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2.0 out of 52.0 out of 52.0 out of 52.0 out of 52.0 out of 5
2 Reviews
 1   Q&A

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